Authenticate rhymes with:
domesticate, prognosticate, sophisticate, abdicate, aguacate, allocate, aluminosilicate, communicate, complicate, dedicate, deprecate, domesticate, educate, equivocate, eradicate, excommunicate, explicate, extricate, fabricate, indicate, intoxicate, misallocate, miscommunicate, pontificate, predicate, prognosticate, reciprocate, rededicate, reeducate, replicate, sophisticate, suffocate, unallocate, uncomplicate